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“ NO binds to the ferrous (Fe(2+)) heme at histidine 105 of the β1 subunit and leads to an increase in sGC activity and cGMP production of at least 200-fold.”
Advances in experimental medicine and biology • 2014 | View Paper
“In particular, coordination of imidazoles like histidine (His ) increases the radical character on NO and, in this way, could help activate the bound NO for catalysis.”